CN112795187A - Polyimide bearing retainer material and preparation method thereof - Google Patents
Polyimide bearing retainer material and preparation method thereof Download PDFInfo
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- CN112795187A CN112795187A CN202011596952.6A CN202011596952A CN112795187A CN 112795187 A CN112795187 A CN 112795187A CN 202011596952 A CN202011596952 A CN 202011596952A CN 112795187 A CN112795187 A CN 112795187A
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- polyimide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Rolling Contact Bearings (AREA)
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Abstract
The invention provides a polyimide bearing retainer material, which uses polyether-ether-ketone, carbon fiber, white carbon black, polytetrafluoroethylene, graphite and a coupling agent as fillers, and has the characteristics of high mechanical strength, high thermal deformation temperature, wear resistance, good dimensional stability and the like by reasonable filler type collocation and proper addition combination.
Description
Technical Field
The invention belongs to the technical field of bearing retainer materials, and particularly relates to a polyimide bearing retainer material and a preparation method thereof.
Background
Polyimide has the characteristics of high and low temperature resistance, high mechanical strength, outstanding electrical insulation performance and the like, and is one of the industrialized high polymer materials with the best comprehensive performance. This is because the polyimide molecule has a large number of imide rings and aromatic rings in the main chain, so that the main chain is generally rigid and the interaction between the molecular chains is strong. The polyimide product has various forms, can be used for manufacturing special engineering plastics, adhesives, coatings, fibers, separation membranes, end-capping materials and the like, and is widely applied to the fields of aerospace, microelectronics, automobiles, photovoltaic energy sources and the like.
Precision bearings are mainly used in precision machine tools and other precision equipment, and require high dimensional stability, good wear resistance, low friction coefficient, high heat resistance and certain mechanical strength for the material used as a cage during high-speed operation.
With the development of plastic material technology, the performance of the plastic composite material is greatly improved, and the plastic has the advantages of small specific gravity, wear resistance, corrosion resistance, radiation resistance, shock resistance and the like, so that the plastic retainer is more widely applied to the rolling bearing. At present, the commonly used plastic retainer materials comprise nylon, polytetrafluoroethylene, polyimide, polyphenylene sulfide, polyether ether ketone and the like, and particularly, the nylon materials are mainly used, and have the characteristics of excellent comprehensive performance, high strength, wear resistance and the like, so that the plastic retainer materials are favored by the industry. However, nylon materials also have many defects, and the molecular chain of the nylon material contains hydrophilic amide groups (-NHCO-), so that the nylon is easy to absorb water, and in the actual production, although the nylon retainer is treated to ensure that the moisture absorption of the nylon retainer is balanced and the water absorption is saturated, the mechanical property and the dimensional stability of the material are reduced; and the nylon has low thermal deformation temperature and narrow use temperature range of-40-160 ℃, and when the nylon retainer is used as a high-speed bearing, the nylon retainer is also often locked by a shaft due to thermal deformation or deformed due to burning, so that the bearing fails. Although the material holders made of other engineering plastics such as polyetheretherketone and polytetrafluoroethylene can overcome the above disadvantages, the raw material cost is greatly increased, which limits the application.
The special use environment of the retainer material has severe requirements on parameters such as strength, toughness, friction coefficient, wear rate and the like of the material, in the prior art, although some researches suggest that the specific performance of the material can be improved by using functional fillers, the types of the added materials are complicated, the addition range is wide, the effect is not easily defined by tests, and the preparation of a composite material with excellent comprehensive performance is still a research hotspot and difficulty at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a polyimide bearing retainer material which uses polyether-ether-ketone, carbon fiber, white carbon black, polytetrafluoroethylene, graphite and a coupling agent as fillers, and has the characteristics of high mechanical strength, high thermal deformation temperature, wear resistance, good dimensional stability and the like through reasonable matching of the types of the fillers and proper addition amount combination.
The invention relates to a polyimide bearing retainer material, which comprises the following components in percentage by weight:
further preferably, the polyimide bearing retainer material comprises the following components in percentage by weight:
further preferably, the polyimide bearing retainer material comprises the following components in percentage by weight:
further, the carbon fibers are chopped carbon fibers and have the length of 3-9 mm.
Furthermore, the carbon fiber is one or more of chopped carbon fibers with the lengths of 3mm, 6mm and 9 mm.
Further, the white carbon black is fumed white carbon black or precipitated white carbon black.
Further, the polytetrafluoroethylene is micropowder.
Further, the particle size of the graphite is 4000-8000 meshes.
Further, the coupling agent is KH550 or KH 560.
The invention also provides a preparation method of the polyimide bearing retainer material, which comprises the following steps:
(1) continuously drying the white carbon black in percentage by weight at the temperature of 80-110 ℃ for 8-12 hours;
(2) adding the material obtained in the step (1) and a coupling agent into a high-speed mixer, and stirring for 10-15 minutes to obtain activated white carbon black;
(3) adding the activated white carbon black obtained in the step (2), polyetherimide, polyether-ether-ketone, polytetrafluoroethylene and graphite into a high-speed mixer, and stirring for 10-15 minutes to obtain a mixture;
(4) and (4) simultaneously feeding the mixture obtained in the step (3) and carbon fibers from different hoppers, and carrying out twin-screw extrusion granulation at the temperature of 360-390 ℃ to obtain bearing retainer granules.
Has the advantages that:
compared with nylon materials, the water absorption of polyetherimide is far lower than that of nylon, the impact strength of polyetherimide can be improved by compounding with polyether-ether-ketone, and carbon fibers are used as a reinforcing phase, so that the mechanical strength and the thermal deformation temperature of polyimide are improved, and the friction coefficient of the material is reduced; the hardness, rigidity and mechanical strength of the material can be improved by the white carbon black subjected to surface treatment; the polytetrafluoroethylene and the graphite are used as lubricants, so that the friction coefficient of the material is further reduced. The polyimide bearing retainer material developed by the invention has higher mechanical strength, better wear resistance and dimensional stability, and can meet the use requirement of high-revolution precision bearings. According to the invention, by reasonably matching the types and the addition amounts of the added materials, the comprehensive performance reduction caused by the mismatching of the types of partial added materials is avoided, and the comprehensive performance reduction caused by too high or too low addition amount is also avoided.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that several modifications can be made by one of ordinary skill in the art without departing from the inventive concept. All falling within the scope of the present invention. For process parameters not specifically noted, reference may be made to conventional techniques.
In the examples:
the tensile strength measurement method is referred to the standard GB/T1040.1-2006;
the ring pull strength measurement method is referred to standard JB/T4037-2007;
the friction coefficient measuring method is referred to the standard GB/T3960-1983;
the impact strength measurement method is referred to the standard GB/T1843-2008.
Example 1
A polyimide bearing retainer material comprises the following raw materials in percentage by weight:
1) continuously baking the white carbon black with the weight percentage at 110 ℃ for 8 hours;
2) adding the material obtained in the step 1) and the coupling agent in percentage by weight into a high-speed mixer, and stirring for 10 minutes to obtain activated white carbon black;
3) adding the activated white carbon black obtained in the step 2) and the polyetherimide, the polyetheretherketone, the polytetrafluoroethylene and the graphite in percentage by weight into a high-speed mixer, and stirring for 15 minutes to obtain a mixture;
4) feeding the mixture obtained in the step 3) and the carbon fiber with the weight percentage from different hoppers at the same time, and carrying out twin-screw extrusion granulation at 365 ℃ to obtain bearing retainer granules.
Example 2
A polyimide bearing retainer material comprises the following raw materials in percentage by weight:
1) continuously baking the white carbon black with the weight percentage at 110 ℃ for 8 hours;
2) adding the material obtained in the step 1) and the coupling agent in percentage by weight into a high-speed mixer, and stirring for 15 minutes to obtain activated white carbon black;
3) adding the activated white carbon black obtained in the step 2) and the polyetherimide, the polyetheretherketone, the polytetrafluoroethylene and the graphite in percentage by weight into a high-speed mixer, and stirring for 15 minutes to obtain a mixture;
4) feeding the mixture obtained in the step 3) and the carbon fiber with the weight percentage from different hoppers at the same time, and extruding and granulating at 375 ℃ by a double screw to obtain the bearing retainer granules.
Example 3
A polyimide bearing retainer material comprises the following raw materials in percentage by weight:
1) continuously baking the white carbon black with the weight percentage at 110 ℃ for 8 hours;
2) adding the material obtained in the step 1) and the coupling agent in percentage by weight into a high-speed mixer, and stirring for 10 minutes to obtain activated white carbon black;
3) adding the activated white carbon black obtained in the step 2) and the polyetherimide, the polyetheretherketone, the polytetrafluoroethylene and the graphite in percentage by weight into a high-speed mixer, and stirring for 15 minutes to obtain a mixture;
4) feeding the mixture obtained in the step 3) and the carbon fiber with the weight percentage from different hoppers at the same time, and extruding and granulating at 385 ℃ by using double screws to obtain the bearing retainer granules.
Comparative example 1
A polyimide bearing retainer material comprises the following raw materials in percentage by weight:
1) continuously baking the white carbon black with the weight percentage at 110 ℃ for 8 hours;
2) adding the material obtained in the step 1) and the coupling agent in percentage by weight into a high-speed mixer, and stirring for 10 minutes to obtain activated white carbon black;
3) adding the activated white carbon black obtained in the step 2) and the polyetherimide, the polyetheretherketone, the polytetrafluoroethylene and the graphite in percentage by weight into a high-speed mixer, and stirring for 15 minutes to obtain a mixture;
4) feeding the mixture obtained in the step 3) and the carbon fiber with the weight percentage from different hoppers at the same time, and extruding and granulating by a double screw at 360 ℃ to obtain the bearing retainer granules.
Comparative example 2
A polyimide bearing retainer material comprises the following raw materials in percentage by weight:
1) continuously baking the white carbon black with the weight percentage at 110 ℃ for 8 hours;
2) adding the material obtained in the step 1) and the coupling agent in percentage by weight into a high-speed mixer, and stirring for 10 minutes to obtain activated white carbon black;
3) adding the activated white carbon black obtained in the step 2) and the polyetherimide, the polyetheretherketone, the polytetrafluoroethylene and the graphite in percentage by weight into a high-speed mixer, and stirring for 15 minutes to obtain a mixture;
4) feeding the mixture obtained in the step 3) and the carbon fiber with the weight percentage from different hoppers at the same time, and carrying out twin-screw extrusion granulation at 365 ℃ to obtain bearing retainer granules.
Comparative example 3
A polyimide bearing retainer material comprises the following raw materials in percentage by weight:
1) continuously baking the white carbon black with the weight percentage at 110 ℃ for 8 hours;
2) adding the material obtained in the step 1) and the coupling agent in percentage by weight into a high-speed mixer, and stirring for 10 minutes to obtain activated white carbon black;
3) adding the activated white carbon black obtained in the step 2) and the polyetherimide, the polyetheretherketone, the polytetrafluoroethylene and the graphite in percentage by weight into a high-speed mixer, and stirring for 15 minutes to obtain a mixture;
4) feeding the mixture obtained in the step 3) and the carbon fiber with the weight percentage from different hoppers at the same time, and extruding and granulating at 375 ℃ by a double screw to obtain the bearing retainer granules.
TABLE 1 table of properties of examples and comparative examples
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The polyimide bearing retainer material is characterized by comprising the following components in percentage by weight:
2. the polyimide bearing cage material of claim 1, comprising the following components in weight percent:
3. the polyimide bearing cage material of claim 1, comprising the following components in weight percent:
4. the polyimide bearing cage material of claim 1, wherein the carbon fibers are chopped carbon fibers having a length of 3 to 9 mm.
5. The polyimide bearing cage material according to claim 1, wherein the white carbon black is fumed silica or precipitated silica.
6. The polyimide bearing cage material of claim 1, wherein the polytetrafluoroethylene is micronized polytetrafluoroethylene.
7. The polyimide bearing cage material according to claim 1, wherein the particle size of the graphite is 4000 to 8000 mesh.
8. The polyimide bearing cage material of claim 1, wherein the coupling agent is KH550 or KH 560.
9. A preparation method of a polyimide bearing retainer material is characterized by comprising the following steps:
(1) continuously drying the white carbon black in percentage by weight at the temperature of 80-110 ℃ for 8-12 hours;
(2) adding the material obtained in the step (1) and a coupling agent into a high-speed mixer, and stirring for 10-15 minutes to obtain activated white carbon black;
(3) adding the activated white carbon black obtained in the step (2), polyetherimide, polyether-ether-ketone, polytetrafluoroethylene and graphite into a high-speed mixer, and stirring for 10-15 minutes to obtain a mixture;
(4) and (4) simultaneously feeding the mixture obtained in the step (3) and carbon fibers from different hoppers, and carrying out twin-screw extrusion granulation at the temperature of 360-390 ℃ to obtain bearing retainer granules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011596952.6A CN112795187A (en) | 2020-12-29 | 2020-12-29 | Polyimide bearing retainer material and preparation method thereof |
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| CN202011596952.6A CN112795187A (en) | 2020-12-29 | 2020-12-29 | Polyimide bearing retainer material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114957981A (en) * | 2022-06-17 | 2022-08-30 | 中山市科倍隆工程塑料有限公司 | Lubricating wear-resistant enhanced engineering plastic alloy and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03188127A (en) * | 1989-12-18 | 1991-08-16 | Ntn-Rulon Corp | Plastic cage for bearing |
| CN109517332A (en) * | 2018-10-25 | 2019-03-26 | 宜宾天原集团股份有限公司 | A kind of polyether-ether-ketone base transformer framework and preparation method thereof |
| CN109705576A (en) * | 2018-12-27 | 2019-05-03 | 中广核高新核材科技（苏州）有限公司 | A kind of wear-resistant self-lubricating thermoplastic polyimide composite material and preparation method thereof |
-
2020
- 2020-12-29 CN CN202011596952.6A patent/CN112795187A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03188127A (en) * | 1989-12-18 | 1991-08-16 | Ntn-Rulon Corp | Plastic cage for bearing |
| CN109517332A (en) * | 2018-10-25 | 2019-03-26 | 宜宾天原集团股份有限公司 | A kind of polyether-ether-ketone base transformer framework and preparation method thereof |
| CN109705576A (en) * | 2018-12-27 | 2019-05-03 | 中广核高新核材科技（苏州）有限公司 | A kind of wear-resistant self-lubricating thermoplastic polyimide composite material and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114957981A (en) * | 2022-06-17 | 2022-08-30 | 中山市科倍隆工程塑料有限公司 | Lubricating wear-resistant enhanced engineering plastic alloy and preparation method thereof |
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